Targeted Data for Subtraction within 20Subtraction within 20 is a critical milestone that requires students to master "counting back" and "bridging ten." This Subtraction within 20 Progress Monitoring Toolkit gives you a systematic way to track this complex skill without the extra "noise." With exactly 10 problems per page, you can calculate mastery in seconds, making your IEP data folders the most organized ones in the building. What’s Included?10 Systematic Math Probes: 10 problems per page